Multi-Pressure Firing Assembly for Perforating Guns
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Solution Overview
Problem
Current perforating techniques face challenges in achieving effective and efficient perforations, especially in directional drilling with long lateral wellbores, due to limitations in perforation density, penetration, and phasing, as well as safety concerns and inefficiencies in equipment and manpower usage. Additionally, pressure-triggered firing assemblies are prone to premature activation during pressure testing, and existing systems require complex and costly secondary control lines.
Innovation Solution
A multi-pressure firing assembly with a mechanical switch mechanism that allows for controlled detonation of perforating gun charges, using a piston valve and firing pin system to manage pressure thresholds and prevent premature activation, enabling efficient and safe perforation without the need for secondary control lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure-triggered firing assemblies are used, then perforation can be achieved, but premature activation during pressure testing occurs
Solution Approach 1:
The firing assembly is segmented into multiple independent components: a firing pin, a piston, and a mechanical switch mechanism. The piston is initially positioned in a first position where it blocks the transfer of pressure to the firing pin. When pressure exceeds a threshold, the piston moves to a second position, activating the mechanical switch which then releases the firing pin. This segmentation allows pressure testing without premature firing while enabling controlled detonation when needed.
Solution Approach 2:
The piston acts as an intermediary element between the pressure source and the firing pin. It mediates the pressure transmission by remaining in a blocking position during normal pressure testing, preventing direct pressure transfer to the firing pin. Only when the piston moves to its activated position does it allow pressure to reach the firing pin, thus controlling the timing and preventing premature activation.
2Productivity
If conventional firing assemblies are used, then perforation can be performed, but complex and costly secondary control lines are required
Solution Approach 1:
The firing assembly is designed to be self-activating through a pressure-sensitive mechanical switch mechanism. The piston automatically moves in response to pressure changes, and the mechanical switch automatically releases the firing pin when the threshold is reached. This eliminates the need for external control lines, electrical wiring, or manual intervention, allowing the system to service itself through the inherent mechanical response to pressure.
Solution Approach 2:
The patent replaces complex electrical or hydraulic control systems with a purely mechanical pressure-sensitive switch mechanism. Instead of using electrical signals transmitted through control lines or hydraulic fluids to activate the firing pin, the system uses direct mechanical coupling where pressure movement of the piston physically actuates the switch and releases the firing pin through mechanical means.
3Adaptability or versatility
If directional drilling with long lateral wellbores is performed, then wellbore access is improved, but perforation effectiveness deteriorates
Solution Approach 1:
The firing assembly incorporates a pressure threshold mechanism that changes the activation parameter from a simple pressure trigger to a controlled threshold-based release. By adjusting the pressure threshold at which the piston moves and the mechanical switch activates, the system can maintain precise control over firing timing even in the challenging environment of long lateral wellbores, compensating for pressure variations and maintaining perforation precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables controlled and efficient perforation in directional drilling, reducing equipment and manpower costs, enhancing perforation quality, and ensuring safe operation by preventing premature detonation during pressure testing, thus improving the overall perforation process.
Implementation Method 1
movement of the piston valve in response to pressure
Implementation Method 2
the movement of which acts as a mechanical switch mechanism controlling movement of the piston valve
Data Source
AI summary
A firing assembly for a wellbore perforating gun or other downhole tool includes: one or more casings connected together to form a firing head containment body, the firing head containment body is in fluid communication with a firing assembly that includes a click pressure firing module that allows the wellbore to be pressurized to high pressures required for pressure testing the well casing one or more times without firing the gun or actuating a certain downhole tool, and after a predetermined number of pressure increase events, allows the subsequent high pressure activation to reach the firing pin or actuation device and fire the gun or activate the tool without further activity from the surface other than applying the pressure.